javascript校验身份证，获取生日、性别、年龄和身份证算法说明

*身份证生成器： http://www.tool7001.com/IDCodeGenerate.aspx

function checkId(pId) {
    //检查身份证号码 
    var arrVerifyCode = [1, 0, "x", 9, 8, 7, 6, 5, 4, 3, 2];
    var Wi = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2];
    var Checker = [1, 9, 8, 7, 6, 5, 4, 3, 2, 1, 1];
    if (pId.length != 15 && pId.length != 18) return "身份证号共有15位或18位";
    var Ai = pId.length == 18 ? pId.substring(0, 17) : pId.slice(0, 6) + "19" + pId.slice(6, 16);
    if (!/^d+$/.test(Ai)) return "身份证除最后一位外，必须为数字！";
    var yyyy = Ai.slice(6, 10), mm = Ai.slice(10, 12) - 1, dd = Ai.slice(12, 14);
    var d = new Date(yyyy, mm, dd), now = new Date();
    var year = d.getFullYear(), mon = d.getMonth(), day = d.getDate();
    if (year != yyyy || mon != mm || day != dd || d > now || year < 1800) return "身份证输入错误！";
    for (var i = 0, ret = 0; i < 17; i++) ret += Ai.charAt(i) * Wi[i];
    Ai += arrVerifyCode[ret %= 11];
    return pId.length == 18 && pId != Ai ? "身份证输入错误！" : Ai;
};

//根据身份证取 省份,生日，性别
function getInfo() {
    //获取输入身份证号码
    var ic = $("#txtCardID").val();
    ic = checkId(ic);
    if (isNaN(ic)) return;
    var ic = String(ic);
    //获取出生日期
    var birth = ic.substring(6, 10) + "-" + ic.substring(10, 12) + "-" + ic.substring(12, 14);
    //获取性别
    var gender = ic.slice(14, 17) % 2 ? "1" : "2"; // 1代表男性，2代表女性
    var sexOption = document.getElementsByName("rabSex");
    for (var i = 0; i < sexOption.length; i++) {
        if (sexOption[i].value == gender) {
            sexOption[i].checked = true;
            break;
        }
    }
    //获取年龄
    var myDate = new Date();
    var month = myDate.getMonth() + 1;
    var day = myDate.getDate();
    var age = myDate.getFullYear() - ic.substring(6, 10) - 1;
    if (ic.substring(10, 12) < month || ic.substring(10, 12) == month && ic.substring(12, 14) <= day) {
        age++;
    }
    $("#txtAge").val(age);
}